Speaking just for myself I think the reasons are several.
This season was worse than any previous.
As long as the show isn't finished there's hope that it will improve and a great ending could've made up for the poor prior seasons.
But no, in the end it left much unexplained. It Deus ex machina'd itself to a lightning fast conclusion and an unsatisfying one whilst destroying character arcs Willy nilly along the way.
So as an analogy it's like seasons 5-7 were having bad sex. Even bad sex can be a little bit good. And before season 8 there's still a chance a great ending makes up for prior poor performance.
But in the end it was just rushed, ended abruptly and without any satisfaction whatsoever.
And it can never be redeemed.
I'm personally shocked anyone at all defends this show now.

Here's the thing. There's tons of things they could've done differently to make the show better with only slightly more time or effort. The fact that they didn't is part of the reason fans are so pissed off.
The writing was lazy, sloppy and rushed.
It's shameful. It's painful.
It's unforgivable in my opinion. Fans care more about their show than they did.

Should be dead.
Daenerys should have killed him when she killed varys as Tyrion told Varys about Jon without informing her. That's treacherous.
Cersei should have killed him with arrows at the parlay. Daenerys should have been informed immediately after Jamie escaped and killed him. And why did he suddenly care about Cersei...at all?
Jon should have died first by Drogon and if not that, as soon as he confessed to greyworm, instant death. But it happened off screen so maybe we aren't supposed to think about it?

Shouldn't Daenerys have had, like, a Queensguard? But no. She just wanders the Red Keep with zero body guards. And after Jon had warned Tyrion not wander around in the Red Keep because "it's not safe" So stupid.
Ah well probably the least of this episodes problems.